That is so pretty! After reading the description and then being presented with a black box, I thought that this would be so boring and stupid. The words "Oh great, it's like Paint with a silly brush. Joy." Man, oh man, was I wrong. It's so relaxing watching the particles and the lines that form.
Great, creative and unusual. 5/5 from me! Thank you, I appreciate your art, erm, work. :-)